Speed Reduction Markings

Image Source: Google Earth

DEFINITION AND DESCRIPTION

Speed Reduction Markings, or optical speed bars (OSBs), are white transverse pavement markings placed on both sides of a lane perpendicular to the centerline, edge line, or lane line with the goal of reducing vehicle operating speeds. The distance between successive bars is reduced progressively to give motorists the impression that their speed is increasing.

Implementation Categories

CONSIDERATIONS

• Initial and final spacing depends on the approach speed and the desired speed.
• Speed Reduction Markings can be painted or thermoplastic.
• Use Speed Reduction Markings sparingly.
• Supplements appropriate warning signs and other traffic control devices.

APPLICATION

• May be installed at horizontal curves, speed transition zones, and TWSC and AWSC intersections to supplement warning signs or traffic control devices.
• Speed Reduction Markings are 1.5 feet long and 1 foot wide. Consult Section 3B.28 of the MUTCD for guidance.

example

Complimentary SSA Strategies

• Speed Feedback Signs
• Horizontal Signing Pavement Markings